BMatthews

For sport flying most of us just leave the excess to dangle out the back.

The winding around a form is a slick idea. But keep in mind that you'll severely reduce the range of the radio with this trick. It's not a bother for something like vertical's racing duties since the models never get far away. But it's not something you'd do on a 1/2A Texaco style model which often is found soaring in a thermal out at speck like distances.

I would ground check the range with both a straight line and the coiled setup. Take note of how much of a ratio it affects the range by. Then do not fly your model out farther than what the reduction indicates for a full antenna. I'd say you'd want to certainly keep the model in tighter than about 500 to 600 feet with the coiled antenna.